Reliability And Reliability Sensitivity Analysis Of High-speed EMU Bogie Frame

In the21st century, the world high-speed railway technology has ushered in the boom development. High safety, high speed, low energy consumption, light environmental pollution and good comfort are inexhaustible motive force for moving forward, and it plays a very important role in the rapid development of the global economy. The high-speed EMU, as the core of high-speed railway, integrates of mechanical, electronics, new materials, computers and many other modern science and technology. Power bogie, which plays host, tug, running and braking roles in high-speed EMU, is the most critical component to decide the safety and dynamics performance of high-speed EMU. The rapid development of China’s national economy increases the pressure on railway transportation gradually, improve the train speed, and promote the progressive development of railway technology. Therefore, increasing the carrying capacity of the bogie and the stability and reliability under high speed are the solved questions in the development of high-speed railway.My thesis based on large number of structural reliability analysis and reliability sensitivity analysis of domestic and foreign countries, analyze the reliability of high-speed train bogie frame and parameter sensitivity. The main analyzing contents:Firstly, through study the three common standards-the international UIC615-4, JIS E4207and China’s "provisional regulations", propose for high-speed railway line350km/h EMU steering bogie frame to analyze the static strength. Secondly, establish3D solid model according to procedure dwg and conduct grid scattered division. Thirdly, call NASTRAN-finite element solver, through it to analyze structural strength and get the stress max of framework under the combinations of conditions, then check whether the maximum stress can meet the material allowable stress needs. Then, apply iSIGHT large integrated software to carry out the DOE experiment to get the relation between the stress of dangerous parts and structural parameters, and use Kriging model to fit which can get the displayed intended function of frame stress with reference with structural parameters. Finally, calculate the frame reliability by fourth moment method and Monte-Carlo, solving the reliability sensitivity of the structural parameters. This study is combined with high-speed bogie frame structure strength analysis and physical experiment, which can decide the optimal load conditions and solution method, which prepare for different lines of research environment for high-speed EMU steering frame strength design. In addition, my thesis summarizes a set of reliability sensitivity design method applied for high-speed EMU steering bogie frame, which provides the important basis for optimal structure of bogie frame. Thus ensure that the bogie frame can be operated safe and stably and provide the technology support for a new generation of high-speed bogie.